1. Advanced Environmental Biotechnology Research Center, Department of Chemical Engineering, School of Environmental Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, South Korea, Environment and Energy Research Center, Research Institute of Industrial Science and Technology, San 32, Hyoja-dong, Pohang 790-600, South Korea, and Advanced Technology Research Laboratories, Nippon Steel Corporation, 20-1 Shintomi, Futtsu, Chiba 293-8511, Japan